Definition of upside down adverb from the Oxford Advanced American Dictionary

  

upside down

 adverb
adverb
 
 
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  •  in or into a position in which the top of something is where the bottom is normally found and the bottom is where the top is normally found The canoe floated upside down on the lake. opposite right side up
  • Idioms
      turn something upside down
       
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    1. 1 to make a place messy when looking for something The police turned the whole house upside down looking for clues.
    2. 2to cause large changes and confusion in a person's life His sudden death turned her world upside down.
    upside downadjective[not usually before noun]
     
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    The painting looks like it's upside down to me.